Buy your phenol-chloroform in from Sigma, they do it ready made with IAA at
your preferred pH (ie. 4.8 for RNA, 8 for DNA) - it comes in well sealed
glass jars, and if you keep it in the fridge its fine for a year, in my hands.
Jon Rees
Webmaster for
http://molbiol.net/ - Portal for Bioinformatics and Molecular Biology
<http://www.biowww.net/forum/read.php?f=1&i=4698&t=4646>